Fiber coating composition having an invisible marker and process for making same
First Claim
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1. A composition comprising a fiber and a near-infrared fluorescing compound associated with said fiber, wherein said near-infrared fluorescing compound comprises a solution having about 0.5 weight percent of a near-infrared fluorophore dissolved in an organic solvent.
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Abstract
Fibers having at least one near-infrared fluorescing compound associated therewith are prepared by contacting the fibers with the fluorescing compound(s) dissolved in an organic solvent. Suitable organic solvents include ketones and alcohols. The fibers may subsequently be air-dried to remove any remaining volatiles. Fibers coated with the marker solution desirably have less than 1 weight percent of the marker coated thereon.
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12 Claims
- 1. A composition comprising a fiber and a near-infrared fluorescing compound associated with said fiber, wherein said near-infrared fluorescing compound comprises a solution having about 0.5 weight percent of a near-infrared fluorophore dissolved in an organic solvent.
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7. A composition comprising a fiber selected from the group consisting of polyester fibers, polyolefin fibers, polyphenylene sulfide fibers, modacrylic fibers, nylon fibers, viscose rayon fibers, cotton fibers, wool fibers, wood pulp and blends thereof and a near-infrared fluorescing compound selected from the group consisting of phthalocyanines, 2,3-naphthalocyanines and squaraines corresponding to Formulae I, II and III:
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where Pc and Nc represent the phthalocyanine and naphthalocyanine moieties of Formulae Ia and IIa, respectively, covalently bonded to a moiety selected from the group consisting of hydrogen and metals selected from the group consisting of AlCl, AlBr, AlOH, AlOR5, AlSR5, Ge, Ge(OR6), Ga, InCl, Mg, SiCl2, SiF2, SnCl2, Sn(OR6)2, Si(SR6)2, or Zn, wherein R5 and R6 are selected from the group consisting of hydrogen, alkyl, aryl, heteroaryl, lower alkanoyl, trifluoroacetyl, groups of the formulae;
R7, R8, and R9 are independently selected from the group consisting of alky, phenyl or phenyl substituted with lower alkyl, lower alkoxy and halogen;
X is selected from the group consisting of oxygen, sulfur, selenium, tellurium and a group of the formula N(R10), wherein R10 is selected from the group consisting of hydrogen, cycloalkyl, alkyl, acyl, alklsulfonyl, and aryl or R10 and R taken together form an aliphatic or aromatic ring with the nitrogen atom to which they are attached;
Y is selected from alkyl, aryl, heteroaryl, halogen or hydrogen;
R is selected from the soup consisting of unsubstituted or substituted alkyl, alkenyl, alkynyl, C3-C8 cycloalkyl, aryl, heteroaryl, and groups of the formulae or (X—
R) moiety is selected from the group consisting of alkylsulfonylamino,
arylsulfonylamino, or a group selected from the formulae —
X(C2H4O)zR1,wherein R1 is hydrogen or R is as defined above;
z is an integer from 1 to 4;
or two (X—
R) moieties can be taken together to form divalent substituents of the formula;
wherein each X1 is independently selected from the group consisting of —
O—
,—
S—
, and —
N(R10)— and
A is selected from the group consisting of ethylene;
propylene;
trimethylene; and
such groups substituted with C1-C4 alkyl, C1-4 alkoxy, aryl and cycloalkyl;
1,2-phenylene and 1,2-phenylene containing 1-3 substituents selected from the group consisting of C1-C4 alkyl, C1-C4 alkoxy and halogen;
R1 and R2 are independently selected from the group consisting of hydrogen, lower alkyl, lower alkoxy, halogen, aryloxy, lower alkyl-thio, arylthio, lower alkylsulfonyl;
arylsulfonyl;
lower alkyl-sulfonyl-amino, lower alkanoylamine, arylsulfonylamino, cycloalkyl-sulfonylamino, carboxy, unsubstituted and substituted carbamoyl and sulfamoyl, lower alkoxycarbonyl, hydroxy, lower alkanoyloxy, and groups of the formulae
R3 and R4 moieties are independently selected from the group consisting of hydrogen, lower alkyl, alkenyl and aryl;
n is an integer from 0-16;
n1 is an integer from 0-24, provided the sums of n+m and n1+m1 are 16 and 24, respectivelyassociated with said fiber, wherein said near-infrared fluorescing compound comprises a solution having about 0.5 weight percent of a near-infrare fluorophore dissolved in an organic solvent selected from the group consisting of ketones and alcohols.
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- 8. A method for tagging fibers with a near-infrared compound comprising the step of contacting said fibers with a solution having in the range of 10 ppm to 0.5 wt % of said near-infrared fluorescing compound dissolved in an organic solvent so as to coat the fibers with in the range of from about 0.1 to about 3 weight percent of said solution.
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12. A method for tagging fibers with a near-infrared compound comprising the step of contacting said fibers with a solution having in the range of 10 ppm to 0.5 wt % of said near-infrared fluorescing compound dissolved in an organic solvent, wherein said natural fibers are selected from the group consisting of wool, cotton, flax, jute, paper, fur, cardboard, wood pulp and mixtures thereof.
Specification